I agree, if they shoot with feathers on them, just do it. 55-60# is close to being on the weak side for your draw length and bow weight, but if they work, go with it.
One thing to keep in mind, you don't always get what you think you do when you buy arrows. I've seen arrows range by more than 20# in sets that are supposed to be grouped within 5#. Also, some builders don't pay attention to the orientation of the spine when they install the nocks. On cedars, a shaft nocked perpendicular to the grain, which is the correct way, will exhibit about 3# or more spine than the same shaft nocked parallel to the grain.
When arrows are spined, they should be spined perpendicular to the grain as well. With electronic spining, that doesn't always happen, and even when spined by hand, builders don't always take the time to do it right. But wood is very forgiving. As long as they're overspined, most wood arrows will shoot quite well out of most bows. But not if they're underspined, unless we're talking selfbows with no or very small sight windows. Good luck. Have fun.